Princeton Applied Research PAR 120 LOCK IN AMPLIFIER- For parts/repair

^^ PRINCETON APPLIED RESEARCH MODEL 115 WIDE BAND PRE AMPLIFIER (DPA69)

PAR MODEL 114 Signal Conditioning Amplifier W/ 118 Differential Preamplifier S1

EG&G PRINCETON APPLIED RESEARCH MODEL 5209 LOCK-IN AMPLIFIER (MPT39)

Stanford Research Systems SR510 Analog Lock-In Amplifier with Rack Mount Kit

Princeton Applied Research PAR Model 114 Amplifier With 185 Preamplifier Plugin

Dagan 2400B Extracellular Preamplifier Current Pump

EG & G Princeton Applied Research 273A Potentiostat Galvanostat Lab. Device